我就是用MDI做的,可一运行就提示我“project person.exe raised exception class EinvalidOperation with message 'can't create form. No MDI forms are currently active' .Process stopped .Use Step or Run to continue.这是怎么回事啊,我已经把主窗体的formstyle属性设置为fsMDIform,副窗体的formstyle属性设置为fsMDIchind,求解,谢谢
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